Question

State the differences between a physical change and a chemical change.

Answer 1

Property	Physical change	Chemical Change
Formation of new substance	There are no new substan ces formed in a physical change.	New substances with different properties are formed in a chemical changes.
Nature of change	It is usually easy to reverse the process, thereby regaining the original substance.	It is usually irreversible.
Energy	Generally energy is neither absorbed nor evolved.	Considerable heat energy is either absorbed or evolved when a chemical change takes place.
Mass	There is no change in the mass of the substance after a physical change.	Mass of a substance changes after a chemical change.